Wealthier children score higher on intelligence, but quality parenting levels the playing field

A study of the TwinLIFE data revealed that children from wealthier families often scored higher on intelligence, and were slightly more emotionally stable and extraverted than their peers from lower socioeconomic backgrounds. The research, published in the Journal of Genetic Psychology, examined the role of parenting in shaping personality traits and intelligence.

Personality traits, while often considered stable, can be influenced by both genetic factors and the environment in which children grow up. Parental traits, parenting styles, time spent with children, and opportunities provided can all impact a child's development. Higher socioeconomic status, which includes income, education, and occupational prestige, may provide more resources for a child's development.

However, the study found that although children from families with higher socioeconomic status tended to exhibit slightly higher intelligence, these differences were not always accompanied by more favorable personality outcomes. The study author, Melchior Vella, suggested that higher socioeconomic status was linked to more favorable personality development.

To test this, Vella analyzed data from the German Twin Family Panel (TwinLIFE), a 12-year study focusing on social inequality development. TwinLIFE collects data through interviews with same-sex twins and their families. The study used data from Cohort 2, which included twins aged 10 to 12. The research involved 1,040 participants, consisting of 392 monozygotic (identical) and 648 dizygotic (fraternal) twins.

The data was collected via face-to-face interviews and measured socioeconomic background, personality traits, fluid intelligence, parenting style, and parental time. The findings showed that children from higher socioeconomic status families tended to have slightly higher fluid intelligence compared to their low socioeconomic status peers.

They also were slightly more emotionally stable and extraverted, though the association with extraversion was modest. Additionally, parents from high socioeconomic status families devoted slightly more time to their children. The use of twin data allowed researchers to separate environmental influences from genetic inheritance. Identical twins share nearly 100% of their DNA, while fraternal twins share about 50%.

By comparing these groups, researchers could identify which traits were shaped by upbringing rather than biology. The study found that parental investments are equally effective regardless of a family's socioeconomic background. Low-income parents who invest the same amount of time and provide positive parenting can achieve the same developmental benefits as high-income parents.

Furthermore, disadvantaged children actually benefit the most from increased parental investment. The study suggests that interventions targeting parental investments and fostering desirable personality traits could significantly improve outcomes, particularly for disadvantaged children, offering a promising avenue for enhancing child welfare and life outcomes.